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Newman Projections

Different notations are used to represent the three-dimensional structure of molecules on two-dimensional surfaces. One of the most commonly used representations is the dash-wedge formula. The dashed wedges, solid wedges, and the plane lines indicate the groups situated behind the plane, coming out of the plane, and in the plane, respectively.
The organic molecules rotate across the single bonds leading to numerous temporary three-dimensional structures of varying energy known as conformers.
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Las hélices de rilenos de tres palas con ensamblaje de red tridimensional para electrónica orgánica

Dong Meng1,2, Huiting Fu1,3,2, Chengyi Xiao1,2

  • 1Beijing National Laboratory for Molecular Sciences, Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190, China.

Journal of the American Chemical Society
|July 22, 2016
PubMed
Resumen

Dos nuevos tintes de perileno conjugados, las hexaimidas de triperileno (TPH) y el TPH anulado por selenio (TPH-Se), muestran excelentes propiedades de transporte de electrones. Estos tintes lograron altas eficiencias de conversión de energía en células solares, lo que demuestra su potencial para aplicaciones optoelectrónicas avanzadas.

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Área de la Ciencia:

  • Ciencias de los materiales
  • Productos electrónicos orgánicos
  • Las instalaciones fotovoltaicas

Sus antecedentes:

  • Las moléculas orgánicas conjugadas son cruciales para el desarrollo de dispositivos optoelectrónicos eficientes.
  • Las bisimidas de perileno (PBIs) son ampliamente estudiadas debido a sus excelentes propiedades de aceptación de electrones y estabilidad.
  • El desarrollo de nuevos derivados de PBI con mejor rendimiento sigue siendo un área de investigación activa.

Objetivo del estudio:

  • Sintetizar y caracterizar dos nuevos tintes de perileno conjugados simétricos con C3: las hexaimidas de triperileno (TPH) y la TPH anulada por selenio (TPH-Se).
  • Investigar las propiedades estructurales, ópticas y electrónicas de TPH y TPH-Se.
  • Evaluar el rendimiento de TPH y TPH-Se en células solares basadas en aceptores.

Principales métodos:

  • Síntesis eficiente de TPH y TPH-Se.
  • Análisis espectroscópico (absorción UV-Vis) para determinar las propiedades ópticas.
  • Difracción de rayos X de un solo cristal para dilucidar las estructuras moleculares y cristalinas.
  • Fabricación y ensayo de transistores monocristalinos para evaluar la movilidad de los electrones.
  • Construcción y caracterización de las células solares basadas en TPH y TPH-Se.

Principales resultados:

  • Tanto el TPH como el TPH-Se presentan una absorción amplia y fuerte (300-600 nm) y niveles de LUMO adecuados (-3,8 eV).
  • TPH muestra una configuración de hélice retorcida y una red 3D con fuertes interacciones π-π.
  • TPH-Se muestra una hélice más distorsionada y una red 3D compacta debido a las interacciones Se··O.
  • Ambos materiales demuestran una buena capacidad de transporte de electrones en transistores de un solo cristal.
  • Las células solares basadas en TPH y TPH-Se obtienen una alta eficiencia de conversión de energía del 8,28% y del 9,28%, respectivamente.

Conclusiones:

  • Los tintes TPH y TPH-Se sintetizados poseen propiedades optoelectrónicas favorables para aplicaciones de células solares.
  • Las configuraciones moleculares únicas y las interacciones intermoleculares contribuyen a su rendimiento mejorado.
  • Estos nuevos derivados del perileno representan materiales prometedores para las células solares orgánicas eficientes.